# std::inplace_vector<T,N>::try_push_back

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< cpp‎ | container‎ | inplace vector

constexpr pointer try_push_back( const T& value ); | (1) | (since C++26)
constexpr pointer try_push_back( T&& value ); | (2) | (since C++26)

Conditionally appends the given element value to the end of the container.

If size() == capacity() is true, there are no effects. Otherwise, appends an object of type `T`:

1) The new element is initialized as a copy of value.
2) value is moved into the new element.

No iterators or references are invalidated, except `end()`, which is invalidated if the insertion occurs.

### Parameters

value | - | the value of the element to append
Type requirements
- `T` must meet the requirements of EmplaceConstructible.

### Return value

std::addressof(back()) if size() < capacity(), nullptr otherwise.

### Complexity

Constant.

### Exceptions

Any exception thrown by initialization of inserted element.

If an exception is thrown for any reason, these functions have no effect (strong exception safety guarantee).

### Notes

| This section is incomplete Reason: Explain the purpose of this API.

### Example

Run this code

    #include <cassert>
    #include <inplace_vector>
    #include <string>

    int main()
    {
        std::inplace_vector<std::string, 2> pets;
        std::string dog{"dog"};

        std::string* p1 = pets.try_push_back("cat"); // overload (1)
        assert(*p1 == "cat" and pets.size() == 1);

        std::string* p2 = pets.try_push_back(std::move(dog)); // overload (2)
        assert(*p2 == "dog" and pets.size() == 2);

        assert(pets[0] == "cat" and pets[1] == "dog");
        assert(pets.size() == pets.capacity());

        std::string* p3 = pets.try_push_back("bug");
        assert(p3 == nullptr and pets.size() == 2);
    }

### See also

push_back | adds an element to the end (public member function)
emplace_back | constructs an element in-place at the end (public member function)
append_range | adds a range of elements to the end (public member function)
try_emplace_back | tries to construct an element in-place at the end (public member function)
try_append_range | tries to add a range of elements to the end (public member function)
unchecked_emplace_back | unconditionally constructs an element in-place at the end (public member function)
unchecked_push_back | unconditionally adds an element to the end (public member function)
pop_back | removes the last element (public member function)
back_inserter | creates a std::back_insert_iterator of type inferred from the argument (function template)

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